When you ask "What number is halfway between 67 and 128?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=67 and Y=128.
To find the number halfway between 67 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 67 and 128 into our formula, we get:
(67 + 128)/2 = 97.5
Thus, the number halfway between 67 and 128 is 97.5.
To check that our answer is correct, we subtract 67 from 97.5 and subtract 97.5 from 128 and compare the two numbers:
97.5 - 67 = 30.5
128 - 97.5 = 30.5
As you can see, the halfway number is 30.5 higher than 67 and 30.5 lower than 128. Therefore, our halfway between answer of 97.5 above is correct.
Halfway Between
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Halfway Between 67 and 129
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